Good news! We just booked Marriott Grande Vista. I showed my husband a very nice video I found on
youtube of the resort. We also found a great rate directly on their website ($135 per night with $30 daily credit for food/drinks)-1 Large guestroom with KING and sofa bed. We have one 13 yr old DS. He said he doesn't mind sleeping on a sofa bed. I think this will be a good resort for us for our Sea World trip. We are regular guests at the WDW moderate level resorts. Seems to me even the large guestrooms offer more than the WDW rooms.